GOA circuit, liquid crystal panel and display device

Abstract

The invention provides a GOA circuit. The GOA circuit comprises multiple GOA structural units which are in cascade connection, and a single-stage GOA structural unit dependents on an Nth GOA structural unit; the Nth GOA structural unit comprises an upward-pull control circuit, an upward-pull circuit, a downlink circuit, a downward-pull circuit, a downward-pull maintenance circuit and a bootstrap capacitor; source electrodes of thin film transistors T42 and T32 in the downward-pull maintenance circuit are connected so that direct-current low-voltage signals can be converted into first reverse clockwise signals, source electrodes of thin film transistors T43 and T33 are connected so that the direct-current low-voltage signals can be converted into second reverse clockwise signals, potentialsof the first reverse clockwise signals and the first clock signals in the downward-pull maintenance circuit at each moment are different, and potentials of the second reverse clock signals and secondclock signals in the downward-pull maintenance circuit at each moment are different. The GOA circuit can effectively solve the problem of forward deflection of threshold voltages of the thin film transistors in the downward-pull maintenance circuit in the single-stage GOA structural unit, and accordingly the reliability and stability of the GOA circuit are improved.

Description

technical field [0001] The present invention relates to the technical field of liquid crystal display, in particular to a GOA (Gate Driver On Array, array substrate row driving) circuit, a liquid crystal panel, and a display device. Background technique [0002] Liquid crystal displays have the advantages of low radiation, small size and low energy consumption, and have gradually replaced traditional cathode ray tube displays in some applications, so they are widely used in notebook computers, personal digital assistants PDA, flat-screen TVs or mobile phones and other products superior. The traditional method of liquid crystal display is to use an external driver chip to drive the chips on the panel to display images, but in order to reduce the number of components and reduce manufacturing costs, in recent years, it has gradually developed to directly fabricate the driver circuit structure on the display panel, such as using GOA technology That is, the gate drive circuit is...

AI Technical Summary

Problems solved by technology

exist figure 2 Generally, two pull-down sustaining circuits are set up ⑤ to work alternately to prevent the thin-film transistors T32, T42, T33, and T43 from being subject to PBS (Positive Bias Stress) for a long time, which will cause the threshold voltage Vth of the device to deflect seriously cause the circuit to fail

[0006] However, figure 2 The two pull-down sustaining circuits ⑤ use the anti-phase signals LC1 and LC2 respectively, that is, the potentials of LC1 and LC2 are different at the same time, but when LC1 is at a high potential, the pull-down sustaining circuit ⑤ on the left side of the single-stage GOA structural unit works, The gate connection point P(N) of the thin film transistors T42 and T32 is in a high potential state for a long time, thus causing the threshold voltage Vth of the thin film transistors T42 and T32 to be deflected forward; similarly, after a period of time, the potentials of LC1 and LC2 are exchanged , the pull-down maintenance circuit ⑤ on the right side of the single-stage GOA structure unit works, making the gate connection point K (N) of the thin film transistor T43 and T33 stay in a high potential state for a long time, thus causing the threshold voltage Vth of the thin film transistor T43 and T33 to appear positive deflection

Repeating this, as the usage time of the single-stage GOA structural unit increases, the threshold voltage Vth of the thin film transistors T32, T42, T33, and T43 will deflect more and more seriously, resulting in the failure of the entire GOA circuit

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